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c906108c | 1 | /* Definitions to make GDB run on an encore under umax 4.2 |
b6ba6518 KB |
2 | Copyright 1987, 1989, 1991, 1993, 1994, 1998, 1999, 2000, 2001 |
3 | Free Software Foundation, Inc. | |
c906108c | 4 | |
c5aa993b | 5 | This file is part of GDB. |
c906108c | 6 | |
c5aa993b JM |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2 of the License, or | |
10 | (at your option) any later version. | |
c906108c | 11 | |
c5aa993b JM |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
c906108c | 16 | |
c5aa993b JM |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
c906108c | 21 | |
f88e2c52 AC |
22 | #include "regcache.h" |
23 | ||
c906108c SS |
24 | /* This is also included by tm-ns32km3.h, as well as being used by umax. */ |
25 | ||
778eb05e | 26 | #define TARGET_BYTE_ORDER BFD_ENDIAN_LITTLE |
c906108c SS |
27 | |
28 | /* Need to get function ends by adding this to epilogue address from .bf | |
29 | record, not using x_fsize field. */ | |
30 | #define FUNCTION_EPILOGUE_SIZE 4 | |
31 | ||
32 | /* Offset from address of function to start of its code. | |
33 | Zero on most machines. */ | |
34 | ||
35 | #define FUNCTION_START_OFFSET 0 | |
36 | ||
37 | /* Advance PC across any function entry prologue instructions | |
38 | to reach some "real" code. */ | |
39 | ||
a14ed312 | 40 | extern CORE_ADDR umax_skip_prologue (CORE_ADDR); |
b83266a0 | 41 | #define SKIP_PROLOGUE(pc) (umax_skip_prologue (pc)) |
c906108c SS |
42 | |
43 | /* Immediately after a function call, return the saved pc. | |
44 | Can't always go through the frames for this because on some machines | |
45 | the new frame is not set up until the new function executes | |
46 | some instructions. */ | |
47 | ||
48 | #define SAVED_PC_AFTER_CALL(frame) \ | |
49 | read_memory_integer (read_register (SP_REGNUM), 4) | |
50 | ||
51 | /* Address of end of stack space. */ | |
52 | ||
53 | #ifndef STACK_END_ADDR | |
54 | #define STACK_END_ADDR (0xfffff000) | |
55 | #endif | |
56 | ||
57 | /* Stack grows downward. */ | |
58 | ||
59 | #define INNER_THAN(lhs,rhs) ((lhs) < (rhs)) | |
60 | ||
61 | /* Sequence of bytes for breakpoint instruction. */ | |
62 | ||
63 | #define BREAKPOINT {0xf2} | |
64 | ||
65 | /* Amount PC must be decremented by after a breakpoint. | |
66 | This is often the number of bytes in BREAKPOINT | |
67 | but not always. */ | |
68 | ||
69 | #define DECR_PC_AFTER_BREAK 0 | |
70 | ||
c5aa993b | 71 | #if 0 /* Disable until fixed *correctly*. */ |
c906108c SS |
72 | #ifndef INVALID_FLOAT |
73 | #ifndef NaN | |
74 | #include <nan.h> | |
c5aa993b | 75 | #endif /* NaN */ |
c906108c SS |
76 | |
77 | /* Return 1 if P points to an invalid floating point value. */ | |
78 | /* Surely wrong for cross-debugging. */ | |
79 | #define INVALID_FLOAT(p, s) \ | |
80 | ((s == sizeof (float))? \ | |
81 | NaF (*(float *) p) : \ | |
82 | NaD (*(double *) p)) | |
83 | #endif /* INVALID_FLOAT */ | |
84 | #endif | |
85 | ||
86 | /* Say how long (ordinary) registers are. This is a piece of bogosity | |
87 | used in push_word and a few other places; REGISTER_RAW_SIZE is the | |
88 | real way to know how big a register is. */ | |
89 | ||
90 | #define REGISTER_SIZE 4 | |
91 | ||
92 | /* Number of machine registers */ | |
93 | ||
94 | #define NUM_REGS 25 | |
95 | ||
96 | #define NUM_GENERAL_REGS 8 | |
97 | ||
98 | /* Initializer for an array of names of registers. | |
99 | There should be NUM_REGS strings in this initializer. */ | |
100 | ||
101 | #define REGISTER_NAMES {"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", \ | |
102 | "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", \ | |
103 | "sp", "fp", "pc", "ps", \ | |
104 | "fsr", \ | |
105 | "l0", "l1", "l2", "l3", "xx", \ | |
106 | } | |
107 | ||
108 | /* Register numbers of various important registers. | |
109 | Note that some of these values are "real" register numbers, | |
110 | and correspond to the general registers of the machine, | |
111 | and some are "phony" register numbers which are too large | |
112 | to be actual register numbers as far as the user is concerned | |
113 | but do serve to get the desired values when passed to read_register. */ | |
114 | ||
115 | #define R0_REGNUM 0 /* General register 0 */ | |
116 | #define FP0_REGNUM 8 /* Floating point register 0 */ | |
117 | #define SP_REGNUM 16 /* Contains address of top of stack */ | |
118 | #define AP_REGNUM FP_REGNUM | |
119 | #define FP_REGNUM 17 /* Contains address of executing stack frame */ | |
120 | #define PC_REGNUM 18 /* Contains program counter */ | |
121 | #define PS_REGNUM 19 /* Contains processor status */ | |
122 | #define FPS_REGNUM 20 /* Floating point status register */ | |
123 | #define LP0_REGNUM 21 /* Double register 0 (same as FP0) */ | |
124 | ||
125 | /* Total amount of space needed to store our copies of the machine's | |
126 | register state, the array `registers'. */ | |
127 | #define REGISTER_BYTES \ | |
128 | ((NUM_REGS - 4) * REGISTER_RAW_SIZE(R0_REGNUM) \ | |
129 | + 4 * REGISTER_RAW_SIZE(LP0_REGNUM)) | |
130 | ||
131 | /* Index within `registers' of the first byte of the space for | |
132 | register N. */ | |
133 | ||
134 | #define REGISTER_BYTE(N) ((N) >= LP0_REGNUM ? \ | |
135 | LP0_REGNUM * 4 + ((N) - LP0_REGNUM) * 8 : (N) * 4) | |
136 | ||
137 | /* Number of bytes of storage in the actual machine representation | |
138 | for register N. On the 32000, all regs are 4 bytes | |
139 | except for the doubled floating registers. */ | |
140 | ||
141 | #define REGISTER_RAW_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4) | |
142 | ||
143 | /* Number of bytes of storage in the program's representation | |
144 | for register N. On the 32000, all regs are 4 bytes | |
145 | except for the doubled floating registers. */ | |
146 | ||
147 | #define REGISTER_VIRTUAL_SIZE(N) ((N) >= LP0_REGNUM ? 8 : 4) | |
148 | ||
149 | /* Largest value REGISTER_RAW_SIZE can have. */ | |
150 | ||
151 | #define MAX_REGISTER_RAW_SIZE 8 | |
152 | ||
153 | /* Largest value REGISTER_VIRTUAL_SIZE can have. */ | |
154 | ||
155 | #define MAX_REGISTER_VIRTUAL_SIZE 8 | |
156 | ||
157 | /* Return the GDB type object for the "standard" data type | |
158 | of data in register N. */ | |
159 | ||
160 | #define REGISTER_VIRTUAL_TYPE(N) \ | |
161 | (((N) < FP0_REGNUM) ? \ | |
162 | builtin_type_int : \ | |
163 | ((N) < FP0_REGNUM + 8) ? \ | |
164 | builtin_type_float : \ | |
165 | ((N) < LP0_REGNUM) ? \ | |
166 | builtin_type_int : \ | |
167 | builtin_type_double) | |
168 | ||
169 | /* Store the address of the place in which to copy the structure the | |
170 | subroutine will return. This is called from call_function. | |
171 | ||
172 | On this machine this is a no-op, because gcc isn't used on it | |
173 | yet. So this calling convention is not used. */ | |
174 | ||
175 | #define STORE_STRUCT_RETURN(ADDR, SP) | |
176 | ||
177 | /* Extract from an array REGBUF containing the (raw) register state | |
178 | a function return value of type TYPE, and copy that, in virtual format, | |
179 | into VALBUF. */ | |
180 | ||
181 | #define EXTRACT_RETURN_VALUE(TYPE,REGBUF,VALBUF) \ | |
182 | memcpy (VALBUF, REGBUF+REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), TYPE_LENGTH (TYPE)) | |
183 | ||
184 | /* Write into appropriate registers a function return value | |
185 | of type TYPE, given in virtual format. */ | |
186 | ||
187 | #define STORE_RETURN_VALUE(TYPE,VALBUF) \ | |
188 | write_register_bytes (REGISTER_BYTE (TYPE_CODE (TYPE) == TYPE_CODE_FLT ? FP0_REGNUM : 0), VALBUF, TYPE_LENGTH (TYPE)) | |
189 | ||
190 | /* Extract from an array REGBUF containing the (raw) register state | |
191 | the address in which a function should return its structure value, | |
192 | as a CORE_ADDR (or an expression that can be used as one). */ | |
193 | ||
194 | #define EXTRACT_STRUCT_VALUE_ADDRESS(REGBUF) (*(int *)(REGBUF)) | |
195 | \f | |
196 | /* Describe the pointer in each stack frame to the previous stack frame | |
197 | (its caller). */ | |
198 | ||
199 | /* FRAME_CHAIN takes a frame's nominal address | |
200 | and produces the frame's chain-pointer. */ | |
201 | ||
202 | /* In the case of the ns32000 series, the frame's nominal address is the FP | |
203 | value, and at that address is saved previous FP value as a 4-byte word. */ | |
204 | ||
205 | #define FRAME_CHAIN(thisframe) \ | |
206 | (!inside_entry_file ((thisframe)->pc) ? \ | |
207 | read_memory_integer ((thisframe)->frame, 4) :\ | |
208 | 0) | |
209 | ||
210 | /* Define other aspects of the stack frame. */ | |
211 | ||
212 | #define FRAME_SAVED_PC(FRAME) (read_memory_integer ((FRAME)->frame + 4, 4)) | |
213 | ||
214 | /* Compute base of arguments. */ | |
215 | ||
216 | #define FRAME_ARGS_ADDRESS(fi) \ | |
217 | ((ns32k_get_enter_addr ((fi)->pc) > 1) ? \ | |
218 | ((fi)->frame) : (read_register (SP_REGNUM) - 4)) | |
219 | ||
220 | #define FRAME_LOCALS_ADDRESS(fi) ((fi)->frame) | |
221 | ||
222 | /* Get the address of the enter opcode for this function, if it is active. | |
223 | Returns positive address > 1 if pc is between enter/exit, | |
224 | 1 if pc before enter or after exit, 0 otherwise. */ | |
225 | ||
226 | extern CORE_ADDR ns32k_get_enter_addr (); | |
227 | ||
f6427ade C |
228 | /* Return number of args passed to a frame. |
229 | Can return -1, meaning no way to tell. */ | |
230 | ||
231 | extern int umax_frame_num_args (struct frame_info *fi); | |
232 | #define FRAME_NUM_ARGS(fi) (umax_frame_num_args ((fi))) | |
233 | ||
c906108c SS |
234 | /* Return number of bytes at start of arglist that are not really args. */ |
235 | ||
236 | #define FRAME_ARGS_SKIP 8 | |
237 | ||
238 | /* Put here the code to store, into a struct frame_saved_regs, | |
239 | the addresses of the saved registers of frame described by FRAME_INFO. | |
240 | This includes special registers such as pc and fp saved in special | |
241 | ways in the stack frame. sp is even more special: | |
242 | the address we return for it IS the sp for the next frame. */ | |
243 | ||
381bab78 AC |
244 | extern int ns32k_localcount (CORE_ADDR enter_pc); |
245 | ||
f6427ade C |
246 | #define FRAME_FIND_SAVED_REGS(frame_info, frame_saved_regs) \ |
247 | { \ | |
248 | register int regmask, regnum; \ | |
249 | int localcount; \ | |
250 | register CORE_ADDR enter_addr; \ | |
251 | register CORE_ADDR next_addr; \ | |
252 | \ | |
253 | memset (&(frame_saved_regs), '\0', sizeof (frame_saved_regs)); \ | |
254 | enter_addr = ns32k_get_enter_addr ((frame_info)->pc); \ | |
255 | if (enter_addr > 1) \ | |
256 | { \ | |
257 | regmask = read_memory_integer (enter_addr+1, 1) & 0xff; \ | |
258 | localcount = ns32k_localcount (enter_addr); \ | |
259 | next_addr = (frame_info)->frame + localcount; \ | |
260 | for (regnum = 0; regnum < 8; regnum++, regmask >>= 1) \ | |
261 | (frame_saved_regs).regs[regnum] = (regmask & 1) ? \ | |
262 | (next_addr -= 4) : 0; \ | |
263 | (frame_saved_regs).regs[SP_REGNUM] = (frame_info)->frame + 4;\ | |
264 | (frame_saved_regs).regs[PC_REGNUM] = (frame_info)->frame + 4;\ | |
265 | (frame_saved_regs).regs[FP_REGNUM] = \ | |
266 | (read_memory_integer ((frame_info)->frame, 4));\ | |
267 | } \ | |
268 | else if (enter_addr == 1) \ | |
269 | { \ | |
270 | CORE_ADDR sp = read_register (SP_REGNUM); \ | |
271 | (frame_saved_regs).regs[PC_REGNUM] = sp; \ | |
272 | (frame_saved_regs).regs[SP_REGNUM] = sp + 4; \ | |
273 | } \ | |
274 | } | |
c906108c SS |
275 | \f |
276 | /* Things needed for making the inferior call functions. */ | |
277 | ||
278 | /* Push an empty stack frame, to record the current PC, etc. */ | |
279 | ||
280 | #define PUSH_DUMMY_FRAME \ | |
281 | { register CORE_ADDR sp = read_register (SP_REGNUM);\ | |
282 | register int regnum; \ | |
283 | sp = push_word (sp, read_register (PC_REGNUM)); \ | |
284 | sp = push_word (sp, read_register (FP_REGNUM)); \ | |
285 | write_register (FP_REGNUM, sp); \ | |
286 | for (regnum = 0; regnum < 8; regnum++) \ | |
287 | sp = push_word (sp, read_register (regnum)); \ | |
288 | write_register (SP_REGNUM, sp); \ | |
289 | } | |
290 | ||
291 | /* Discard from the stack the innermost frame, restoring all registers. */ | |
292 | ||
293 | #define POP_FRAME \ | |
294 | { register struct frame_info *frame = get_current_frame (); \ | |
295 | register CORE_ADDR fp; \ | |
296 | register int regnum; \ | |
297 | struct frame_saved_regs fsr; \ | |
298 | struct frame_info *fi; \ | |
299 | fp = frame->frame; \ | |
300 | get_frame_saved_regs (frame, &fsr); \ | |
301 | for (regnum = 0; regnum < 8; regnum++) \ | |
302 | if (fsr.regs[regnum]) \ | |
303 | write_register (regnum, read_memory_integer (fsr.regs[regnum], 4)); \ | |
304 | write_register (FP_REGNUM, read_memory_integer (fp, 4)); \ | |
305 | write_register (PC_REGNUM, read_memory_integer (fp + 4, 4)); \ | |
306 | write_register (SP_REGNUM, fp + 8); \ | |
307 | flush_cached_frames (); \ | |
308 | } | |
309 | ||
310 | /* This sequence of words is the instructions | |
c5aa993b JM |
311 | enter 0xff,0 82 ff 00 |
312 | jsr @0x00010203 7f ae c0 01 02 03 | |
313 | adjspd 0x69696969 7f a5 01 02 03 04 | |
314 | bpt f2 | |
c906108c SS |
315 | Note this is 16 bytes. */ |
316 | ||
317 | #define CALL_DUMMY { 0x7f00ff82, 0x0201c0ae, 0x01a57f03, 0xf2040302 } | |
318 | ||
319 | #define CALL_DUMMY_START_OFFSET 3 | |
320 | #define CALL_DUMMY_LENGTH 16 | |
321 | #define CALL_DUMMY_ADDR 5 | |
322 | #define CALL_DUMMY_NARGS 11 | |
323 | ||
324 | /* Insert the specified number of args and function address | |
325 | into a call sequence of the above form stored at DUMMYNAME. */ | |
326 | ||
381bab78 AC |
327 | void flip_bytes (void *ptr, int count); |
328 | ||
c906108c SS |
329 | #define FIX_CALL_DUMMY(dummyname, pc, fun, nargs, args, type, gcc_p) \ |
330 | { \ | |
331 | int flipped; \ | |
332 | flipped = fun | 0xc0000000; \ | |
333 | flip_bytes (&flipped, 4); \ | |
334 | *((int *) (((char *) dummyname)+CALL_DUMMY_ADDR)) = flipped; \ | |
335 | flipped = - nargs * 4; \ | |
336 | flip_bytes (&flipped, 4); \ | |
337 | *((int *) (((char *) dummyname)+CALL_DUMMY_NARGS)) = flipped; \ | |
338 | } |